Its failing to go through the full boot process. Try pressing F8 on boot until the boot option screen comes up and then select safe mode. Follow this though until you are given the option of using system restore instead of safe mode. take that option by clicking on the NO button. Restore the machine to a date some time a few days previous to the fault developing.

If that fails then put in any OS disc and boot from it. select R at the first options screen, follow it through and then select the C drive option. Just hit enter when asked for admin password.

now type chkdsk /r (copy and paste this to be sure). let it run and then reboot and see what happens

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Ok on keyboard, press WINDOWS logo see start page comes up. using keypads arrow keys, access the control panel, find mouse, if you are using vista, set classic view. you may get around by tab key and up>down>rigth>left arrow keys.
Install driver again or use update \. come back start and shot down the computer by shotdown arrow, do not use brown button will not shotdown, it is stanby (On vista). Then turn on again see what you see>
If can not, Just use same system and reach out the system tools from accessories>system tools>Make defragmentation.
No result > make system restore. No result see tech.
JMC

Try booting up after installing an external USB mouse. This may give you a mouse to install new keyboard drivers.If the problem is the keyboard/tracking pad, (hardware) installing another keyboard may eliminate the issue.

In this case you have to do the PC restore . you can do that in dell machines by shutting down the machine and when it is coming back on just HOLD DOWN THE CTRL ket and the START HITTING f11 key in this case you will lose the data which you have the on the c drive but this issue will get resolved .

Else you can try to restart in the safe mode with networking and then go to the system restore and then select the bold dates in which you have idea you system was working fine . selct the date and then do the system restore . In this case you will not lose the data but you will lose the updates which you have done after that date .

If tried the monitor on two other computers with the same result -- definitly your monitor is faulty. Take it to the repair shop. To make double sure, run your computer with another monitor. If everything is fine now; you can blame the monitor.

Once, at University, someone had flipped the screens of all the public computers (running on Windows XP) of the English
Department upsidedown. The wallpaper, desktop icons, fonts, mouse-cursor and even the start-up screen...everything was displayed or moved upsidedown. People could not check out their e-mails or surf or do anything.
To reverse the upsidedownscreen mode, press ctrl, alt and the up arrow (arrows console) at the same time; the screen will probably go blank. Turn off the monitor, turn it on again and the display will be normal again. If you possess a sense of humour or are antisocial, press ctrl, alt and the down arrow simultaneously, turn off the monitor, turn it on again and everyone (excluding the culprit) will be desperate --> upsidedown! Works for Windows XP Home and Prof.